Electrochemical Studies and Images Performance of La2O3/TiO2 for Energy Storage

MRS Advances ◽  
2016 ◽  
Vol 1 (6) ◽  
pp. 395-402
Author(s):  
C.G. Nava-Dino ◽  
N.L. Mendez-Mariscal ◽  
G. Llerar-Meza ◽  
R.A. Acosta-Chavéz ◽  
M.E. Lopéz-Ochoa ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Counter Electrode ◽  
Weight Ratio ◽  
Reference Electrode ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
Storage Material ◽  
X Ray ◽  
Ball Milling Technique ◽  
Experimental Runs

ABSTRACTPowders of La2O3 were mixed with mechanical ball-milling technique (MA) adding TiO2, to improve the electrochemical performance as a storage material. Microstructures, morphologies and electrochemical results were investigated using TEM, X-ray diffraction (XRD), Cyclic Voltammetry and Potentiodynamic studies. Results showed that, the samples with TiO2 content affected the capacity of response. The alloys exhibit a superior capacity and stability adding TiO2. The milling ball to powder weight ratio was kept 5 to 1 for all experimental runs. Milling intervals were 0, 2 and 4 hrs; using alternate cycles of 30 minutes milling and 30 min resting. The nanostructure TiO2 powder, improves the samples to design a better electrode. TiO2 has significant influence on electrochemical performance of electrodes. Electrochemical experiments were performed on ACM Instruments Gill AC and a typical three electrode setup was constructed to measure the electrochemical properties of the working electrode. Here, platinum was used as the counter electrode and calomel was used as the reference electrode. Structures of the samples were analyzed by digital image tools.

scholarly journals Continuous Composition Spread and Electrochemical Studies of Low Cobalt Content Li(Ni,Mn,Co)O2 Cathode Materials

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 366 ◽  
Author(s):  
JongSeok Jung ◽  
Haena Yim ◽  
Narendra Singh Parmar ◽  
Jae-Seung Lee ◽  
Ji-Won Choi
Keyword(s):  
Thin Film ◽  
Electrochemical Performance ◽  
Cathode Materials ◽  
Electrochemical Impedance ◽  
Cobalt Content ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
X Ray Absorption

Many scientific efforts have been undertaken toward reducing the Co content in LiMn1/3Ni1/3Co1/3O2 cathode materials for thin-film batteries. In this study, we present cathodes with a wide range of Li(Ni, Mn, Co)O2 compositions to determine the material with the best electrochemical performance by changing the ratio of Ni to Mn at a fixed 0.1 at.% of Co by the continuous composition spread sputtering method. The cathode composition measurements by Rutherford backscattering spectroscopy show that the best electrochemical performance is obtained for a composition of Ni:Mn:Co = 19:71:10. The reasons for this improved electrochemical performance are further investigated by X-ray diffraction, electrochemical impedance spectroscopy, Fourier-transform infrared spectroscopy, and X-ray absorption near edge spectroscopy.

Preparation of TiO2-diatomite composites by ball-milling and its photocatalytic degradation of methyl orange

2011 ◽  
Vol 11 (1) ◽  
pp. 121-127 ◽  
Author(s):  
Yanxi Deng ◽  
Xuming Wang ◽  
Jinfeng Yin ◽  
Yanfeng Li ◽  
Hao Ding ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Ball Milling ◽  
Particle Concentration ◽  
Milling Time ◽  
Weight Ratio ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ball Milling Technique ◽  
Degradation Of Methyl Orange

TiO2-diatomite composites were prepared using a two–stage ball-milling technique and they were subsequently characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and FTIR, showing that nanotitania had been successfully supported on the surface of diatomite. The as-prepared TiO2–diatomite composites were used to decompose methyl orange (MO). Good degradation efficiency was observed. The effects of milling conditions, such as milling time of diatomite suspension, the diatomite particle concentration in suspension, weight ratio of ball-to-powder, milling time of the mixed TiO2-diatomite suspension and dosage of titania, on photocatalytic degradation performance were systematically examined for the sake of achieving the best efficiency.

scholarly journals Non-invasive Electrochemical Detection of Glucose using CuO-NiO/MXene Modified Electrode

2020 ◽  
Author(s):  
Alaa Mohamed Elsafi ◽  
Vinotha Krishnasamy ◽  
Karthik Kannan ◽  
John-John Cabibihan ◽  
Abdulaziz Khalid AlAli ◽  
...  
Keyword(s):  
Morphological Analysis ◽  
High Selectivity ◽  
Proton Conductor ◽  
Carbon Electrodes ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
Characterization Methods ◽  
Glassy Carbon Electrodes ◽  
X Ray ◽  
Non Invasive

High levels of glucose or acetone in breath confirms diabetes disease. One of the analytical devices that detect changes in breath is the electrochemical sensor having high selectivity, easy to use and being able to meet diabetic patient’s needs. In this study, sensors were made by fabricating metal oxide coated glassy carbon electrodes and using nafion as a proton conductor. Characterization methods such as X-ray diffraction, FTIR and morphological analysis have been performed for metal oxides to characterize their atomic arrangement and composition. In addition, electrochemical studies were done using Gamry instrument and curves plotted as current in amperes versus voltage to test the coated electrodes conductivity. High selectivity sensors provide promising applications in any field.

Two New Mn(II) and Co(II) Complexes with the Tridentate 2,4,6-Tris(2-pyridyl)-1,3,5-triazine Ligand

2005 ◽  
Vol 60 (1) ◽  
pp. 99-105 ◽  
Author(s):  
Arpi Majumder ◽  
Chirantan Roy Choudhury ◽  
Samiran Mitra ◽  
Christoph Marschner
Keyword(s):  
Single Crystal ◽  
Tridentate Ligand ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Elemental Analyses

Two new complexes of manganese(II) and cobalt(II), [Mn(tptz)(OCH3CO)(H2O)2]ClO4 (1) and [Co(tptz) (OSO3) (H2O)2](H2O)2 (2) {where tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine}, have been prepared and characterised by elemental analyses, spectroscopic, electrochemical studies and single crystal X-ray diffraction. Single crystal X-ray analysis reveals complexes of Mn(II) and Co(II), where tptz remains intact and behaves as a tridentate ligand and forms heptacoordinated Mn(II) and hexacoordinated Co(II) complexes for 1 and 2, respectively.

scholarly journals Electrodeposition of Hydroxyapatite on a Metallic 3D-Woven Bioscaffold

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 715 ◽  
Author(s):  
Ju Xue ◽  
Ashley Farris ◽  
Yunfei Wang ◽  
Weiyan Yeh ◽  
Cristina Romany ◽  
...  
Keyword(s):  
Reference Electrode ◽  
Deposition Potential ◽  
Cellular Adhesion ◽  
Cell Seeding ◽  
X Ray Diffraction ◽  
X Ray ◽  
Woven Bone ◽  
Electrochemically Deposited ◽  
Seeding Efficiency ◽  
Stromal Stem Cells

In this study, we demonstrate that a uniform coating of hydroxyapatite (HAp, Ca10(PO4)6(OH)2) can be electrochemically deposited onto metallic 3D-woven bone scaffolds to enhance their bioactivity. The HAp coatings were deposited onto metallic scaffolds using an electrolyte containing Ca(NO3)2·4H2O, NH4H2PO4, and NaNO3. The deposition potential was varied to maximize the uniformity and adhesion of the coating. Using X-ray diffraction (XRD), Raman spectroscopy, and energy-dispersive spectroscopy (EDS), we found crystallized HAp on the 3D-woven lattice under all deposition potentials, while the −1.5 V mercury sulfate reference electrode potential provided the best local uniformity with a satisfactory deposition rate. The coatings generated under this optimized condition were approximately 5 µm thick and uniform throughout the internal and external sections of the woven lattice. We seeded and cultured both coated and uncoated scaffolds with human adipose-derived stromal/stem cells (ASCs) for 12 h and 4 days. We observed that the HAp coating increased the initial cell seeding efficiency by approximately 20%. Furthermore, after 4 days of culture, ASCs cultured on HAp-coated stainless-steel scaffolds increased by 32% compared to only 17% on the uncoated scaffold. Together, these results suggest that the HAp coating improves cellular adhesion.

Supramolecular assemblies of phenolic metalloporphyrins: Structures and electrochemical studies

2019 ◽  
Vol 23 (01n02) ◽  
pp. 103-116 ◽  
Author(s):  
Gia Co Quan ◽  
Morgane Denis ◽  
Brian Abeykoon ◽  
Jean-Bernard Tommasino ◽  
Erwann Jeanneau ◽  
...  
Keyword(s):  
Supramolecular Assembly ◽  
Electrochemical Studies ◽  
Redox Behavior ◽  
Metallic Ions ◽  
X Ray Diffraction ◽  
Supramolecular Compounds ◽  
One Dimensional ◽  
X Ray ◽  
Axial Coordination ◽  
Supramolecular Architectures

The reactivity of two phenolic porphyrins bearing respectively catechol and gallol-derived meso substituents (5,10,15,20-tetrakis(3,4-dihydroxyphenyl)porphyrin and 5,10,15,20-tetrakis(3,4,5-trihydroxyphenyl)porphyrin) with trivalent metallic ions (Fe, Mn, In) was studied. Six supramolecular compounds were obtained and structurally characterized by single crystal X-ray diffraction. In each compound, the supramolecular assembly was based on the axial coordination of a phenolate function to the metallic ion lying in the porphyrinic core. A great diversity of supramolecular architectures was accessible through such simple arrangements, and objects ranging from dimers to one-dimensional polymers were isolated. Some of these assemblies were further investigated in solution by mass spectrometry and by UV-vis absorption spectroscopy. For the iron-based materials, the redox behavior was studied in solution through cyclic voltammetry experiments in inert conditions and under air.

scholarly journals [FeII(L•)2][TCNQF4•−]2: A Redox-Active Double Radical Salt

2019 ◽  
Vol 72 (10) ◽  
pp. 769 ◽  
Author(s):  
Ian A. Gass ◽  
Jinzhen Lu ◽  
Ruchika Ojha ◽  
Mousa Asadi ◽  
David W. Lupton ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Radical Anion ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
Neutral Radical ◽  
X Ray ◽  
Redox Active ◽  
Diffusion Controlled ◽  
Radical Salt ◽  
Radical Ligand

The reaction of [FeII(L•)2][BF4]2 with LiTCNQF4 results in the formation of [FeII(L•)2][TCNQF4•−]2·2CH3CN (1) (L• is the neutral aminoxyl radical ligand 4,4-dimethyl-2,2-di(2-pyridyl)oxazolidine-N-oxide; TCNQF4 is 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane). Single-crystal X-ray diffraction; Raman, Fourier-transform infrared (FTIR) and ultraviolet–visible spectroscopies; and electrochemical studies are all consistent with the presence of a low-spin FeII ion, the neutral radical form (L•) of the ligand, and the radical anion TCNQF4•−. 1 is largely diamagnetic and the electrochemistry shows five well-resolved, diffusion-controlled, reversible one-electron processes.

Hydrothermal Synthesis and Electrochemical Performance of WO3 Nanoparticles

2013 ◽  
Vol 750-752 ◽  
pp. 217-220
Author(s):  
Li Jin Feng ◽  
Rong Ma ◽  
Xiu Hua Li ◽  
Xu Chun Song
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cyclic Voltammetry ◽  
Hydrothermal Synthesis ◽  
Electrochemical Performance ◽  
Electrochemical Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Intercalation ◽  
Transmission Electron

In the present paper, the WO3 nanoparticles were fabricated via a hydrothermal treatment. The products are characterized in detail by multiform techniques: transmission electron microscopy, X-ray diffraction. The results show that products are WO3 nanoparticles with diameter of about 100-150 nm. Electrochemistry properties of the prepared WO3 nanoparticles was characterized by cyclic voltammetry. Cyclic voltammetry results indicate that WO3 nanoparticles exhibits a remarkable electrochemical activity for hydrogen intercalation. The reason for electrochemical activity of WO3 nanoparticles is attributed to the formation of HxWO3 by hydrogen intercalation/de-intercalation into/out of the tungsten oxide.

Characterization of Electrospun Poly(Lactic Acid)/polyaniline Blend Nanofibers

2011 ◽  
Vol 332-334 ◽  
pp. 317-320 ◽  
Author(s):  
Hui Qin Zhang
Keyword(s):  
Lactic Acid ◽  
Composite Nanofibers ◽  
Weight Ratio ◽  
Electrospinning Process ◽  
Poly Lactic Acid ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Ft Ir

In this study, composite nanofibers of polyaniline doped with dodecylbenzene sulfonic acid (PANI-DBSA) and Poly(lactic acid) (PLA) were prepared via an electrospinning process. The surface morphology, thermal properties and crystal structure of PLA/PANI-DBSA nanofibers are characterized using Fourier transform infrared spectroscopy (FT-IR), wide-angle x-ray diffraction (WAXD) and scanning electron microscopy (SEM). SEM images showed that the morphology and diameter of the nanofibers were affected by the weight ratio of blend solution.

scholarly journals Direct Synthesis of (K0.5Na0.5)NbO3Powders by Mechanochemical Method

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Nguyen Duc Van
Keyword(s):  
Milling Time ◽  
Direct Synthesis ◽  
Weight Ratio ◽  
Intermediate Species ◽  
X Ray Diffraction ◽  
Mechanochemical Method ◽  
X Ray ◽  
Milling Parameters ◽  
First Time ◽  
Carbonato Complex

The synthesis and structural properties of lead-free piezoelectric (K0.5Na0.5)NbO3powders prepared by mechanochemical method using Nb2O5, K2CO3, and Na2CO3as starting materials were reported. X-ray diffraction, infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy were used to characterize the prepared samples. Results showed that, for the first time, by selecting the milling speed of 600 rpm and the ball-to-powder weight ratio of 35 : 1 as milling parameters, pure (K0.5Na0.5)NbO3crystalline phase was obtained directly in the as-milled samples after 5 h of milling time. The existence of a carbonato complex betweenCO32−and Nb5+ions as an intermediate species of the formation of (K0.5Na0.5)NbO3was also found.

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